Fan for anti-dust helmet



FIG. 1 is a perspective view taken from the top, front, and one side of a fan for an anti-dust helmet showing our new design;

FIG. 2 is a perspective view taken from the bottom, rear, and side opposite that in FIG. 1;

FIG. 3 is an elevational view taken from the side shown in FIG. 1;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a fan for anti-dust helmet, as shown. 